Another tweet said Ms. McCarthy cites fraudulent research and it was irresponsible to provide her with a platform on the popular daytime talk show.

In a later press conference Barbara Yaffe, Toronto’s associate medical officer of health, said immunizations have saved more lives than anything else in medicine and “opinions don’t equal facts.”

The initial tweet included a link to a fact sheet on the impact of vaccines in Canada that shows almost complete eradication of diseases like measles, mumps, rubella and polio since vaccines were introduced.

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